جستجوی مقالات مرتبط با کلیدواژه « mashhad chenaran » در نشریات گروه « آب و خاک »

Considering the importance of agriculture in developing countries¡ it is quite necessary to apply a programmed planning pattern based on different goals. His study used the linear andmulti objective programming patterns following three main purposes such as maximizing the gross margin¡ water productivity and energy efficiency to determine the crop pattern of the small farms in Mashhad – Chenaran span. To gather data¡ a questionnaire was given to 79 farmers in farms below 5 hectare in planting year 92-93. The result showed that determining the crop pattern using a linear program aiming at water benefit will decrease water demand about 27 percent in this study zone. His will increase the income of the farmers and also the water benefit about 2/88 time and 28 percent respectively. The crop pattern based on three purposes mentioned above following weighting and constrained methods like linear programming patterns has a stable agricultural index . It also enjoys more variety of products than linear programming patterns but it will intensify the paucity of the storage aquifer in the study zone. With respect to the paucity of water sources in the district and the policies of thecountry in the realm of agriculture¡ the crop patterns aimed at maximized water productivity and weighting method¡ the triple purposes mentioned above is recommended.

Agriculture as the largest consumer of water، compared to other sectors، is faced with more challenges due to lack of water and the gap between supply and demand for water. The aim of this study is to identify the effective factors on irrigation water demand at farm-level. Data was collected from farmers of Mashhad-Chenaran plain by stratified random sampling method in 2013. The discriminate analysis was used to recognize effective variables on dividing farmers in two groups، low and high water consumption. Result showed that the most important of effective factors to distinguish farmers’ treatment to use of water at farm level are crop، water saving، income of the farmer، soil texture، experience، education level and flow rate of water taken with correlation coefficients 0. 69، 0. 3، 0. 28، -0. 25، -0. 22، 0. 19 and 0. 16 respectively. Also، the results indicated that the value of Lambda Wilkes of discriminant equation to distinguish low and high water used is equal to 0. 61 that is significant at 99% level of probability. According to the results، raising awareness of farmers coupled with increasing facilities to improve water saving technologies and subsidizing for low withdrawal of water from wells، can be useful for efficient use of water، use of assessing tools، control the amount of irrigation water applied in farm and correct implementation of modern irrigation systems in the study area.